There are some significant differences in the design and use of Hydraulic Prop and conventional Props. Some of the key differences and features are listed below:
Adjustable Props:
Adjustables Props can be changed by changing the pitch of the paddle blade, in a variety of working conditions to make full use of the host power, to adapt to a variety of working conditions, good manoeuvrability. Commonly used in tugboats, fishing boats, icebreakers, pontoon boats, warships and other ships with multiple working conditions.
Adjustable Props include that it can fully use all the power of the main engine under any sailing conditions, improve its manoeuvrability and manoeuvrability; reduce the number of times the main engine is adjusted, prolong the service life of the main engine, and save the fuel consumption.
Hydraulic Prop:
Most of the servo pitch cylinders used in the Hydraulic Prop are placed in the paddle hub, and there are also integrated in the shaft system.
Hydraulic system unit and electronic control system unit is a typical crank-slider type pitch Props important components.
Prop type and performance:
The Prop generally has 3 to 4 blades, and the diameter is determined according to the ship's horsepower and draft. The speed of the Props should not be too high, and the material is generally manganese bronze or corrosion-resistant alloy.
The efficiency of the Prop is expressed as the ratio of the output power of the Prop to the input power, and the output power is the product of the pull force of the Prop and the flight speed.
Installation and use of the Prop:
During installation, it is necessary to measure the distance from the end face of the tailshaft to the end face of the Prop hub, and to find a graph of the press-in and calculate the axial thrust according to the Prop hydraulic calculation instructions.
When the Hydraulic Prop is installed, the dry pressure press-in amount to a certain amount of wet pressure, the specific operation needs to be carried out according to the requirements of the manual.
Efficient Prop blade design:
Blade profile plays a very important role in propulsion efficiency. Studies and experiments using Prop with different blade areas have shown that efficiency increases with reduced blade area.
Fluid density has no effect on the efficiency of the Prop but has a great influence on its size and shape.
Through these characteristics and differences, it can be seen that Hydraulic Prop have higher flexibility and adaptability in design and use, and can better meet the navigation needs of different ships.
